Park Chan Yeol, 21 years old.

Heir to the famous Park Cooperations.

Also an idol. Main rapper of the famous rising boy band from SM Entertainment, EXO.

He is known as the happy virus of the group, always having a smile on his face whenever and wherever. His teeth are well known to be real perfect, white and straight.

But…. Is that really who he is?

Park Chan Yeol, the side of him which is not an idol. Who knows him well? Obviously the EXO members and the managers of EXO. And of course, his soon-to-be wife, Jeon Minyeong.

Chanyeol, the one who has a poison tongue, the one who doesn’t smile all the time at all and the one who doesn’t love his fiancée at all. All he does is flaunts his riches, which technically ain’t his yet, it is still his father’s and by promising to marry Minyeong he gets what he wants – money, and that’s what he plans to do.

Jeon Minyeong, You, 20 years old. Not an heiress or anything, just a common girl.

Now, the question is, “why is she betrothed to Chanyeol then?”

Well, it was not for any merging of companies to make the company richer, yada yada yada, it was simply because of a promise their granddads made.

Since their parents obviously did not fulfill the promise, it was their childrens'‘turn’ to fulfill it.

That was what Chanyeol’s father promised his dad and he wants it to be fulfilled.

That’s how you got into this mess.

Minyeong and Chanyeol are childhood buddies too.

They grew up together, went to school together, yet they were not that close.

Minyeong saw how Chanyeol behaves when he’s putting on the whole ‘Happy Virus’ façade. She knows how he is like when that mask is off.

Yet, she still has that tiny crush on him.

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How will things turn out for this bittersweet couple?

Will Chanyeol love her? Will they love each other and live happily ever after?